Home
Current Affairs January 2024

What is the correct answer?

4

If the value of 0 a conductor is 1/234 per oCa then the value of 18is

A. 1/218 per oC

B. 1/252 peroC

C. 1/272 per oC

D. 1/273 per oC

Correct Answer :

B. 1/252 peroC


Related Questions

What is the correct answer?

4

The emf induced in a coil due to the change of its own flux linked with it is called

A. Mutually induced emf

B. Dynamically induced emf

C. Statically induced emf

D. Self induced emf

What is the correct answer?

4

The resistance of a material is ____________ its area of cross-section.

A. directly proportional

B. independent of

C. inversely proportional to

D. equal to

What is the correct answer?

4

A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6

A. 5 × 10^-6

B. 500 × 10^-6

C. 500 × 10^-5

What is the correct answer?

4

States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.

A. Wien's displacement law

B. Hartleys law

C. Hall's law

D. Wiedemann Franz law

What is the correct answer?

4

The unit of flux density is

A. Wb/m

B. Tesla

C. At/m

D. N/Wb

What is the correct answer?

4

If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa the outstretched thumb will then point the north pole. This is known as

A. Right hand rule

B. Helix rule

C. End rule

D. Cork screw rule

What is the correct answer?

4

There are how many compounds available in nature?

A.

B.

C. 300a000

D. Unlimited

What is the correct answer?

4

What is the SI unit of reluctance?

A. At

B. At/m

C. N/Wb

D. At/Wb

What is the correct answer?

4

Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as

A. Joule's Law

B. Coulomb's Law

C. Faraday's first law of electromagnetic induction

D. Faraday's second law of electromagnetic induction

What is the correct answer?

4

The force which set ups or tends to set up magnetic flux in a magnetic circuit

A. Dynamic force

B. Electromotive force

C. Potential difference

D. Magnetomotive force

What is the correct answer?

4

One oersted (Oe) is equivalent to _____ Gb/cm.

A.

B.

What is the correct answer?

4

What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?

A. 6366 A, t/Wb

B. 6000 A, t/Wb

C. 8x10^-3 A, t/Wb

D. 0.8 A, t/Wb

What is the correct answer?

4

An atom or a group of atoms that carries a net electric charge.

A. Positive ion

B. Negative ion

C. Ion

D. Electron

What is the correct answer?

4

Refers to the non- metallic materials that have the ferromagnetic properties of iron.

A. Ferrites

B. Ferromagnetic

C. Diamagnetic

D. Paramagnetic

What is the correct answer?

4

Gases whose particles are charged are known as

A. Conductors

B. Insulators

C. Gaseous Conductors

D. Plasma

What is the correct answer?

4

The evaporation of electrons from a heated surface is called

A. Radiation

B. Convection

C. Thermionic emission

D. Conduction

What is the correct answer?

4

______ is an electromagnet with its core in the form of a close magnetic ring.

A. S olenoid

B. Paraboloid

C. Toroid

D. Cycloid

What is the correct answer?

4

The unit of flux is _____ in cgs system.

A. Tesia

B. Gilbert

C. Maxwell

D. Oersted

What is the correct answer?

4

Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.

A. directly proportional to

B. inversely proportional to

C. dependent of

D. independent of

What is the correct answer?

4

The relative permeability of a magnetic material is 10^5. What is its permeability?

A. 4 × 10^5 H/m

B. 4 × 10^-12 H/m

C. 4× 10^-2 H/m

D. 4 × 10^7H/m

What is the correct answer?

4

A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.

A. Joule's law

B. Faraday's law

C. Coulomb's law

D. Lenz' law

What is the correct answer?

4

The force between two magnetic poles is _____ the relative permeability of the medium.

A. directly proportional to

B. independent of

C. inversely proportional to

D. equal to

What is the correct answer?

4

Magnetic intensity is a

A. Phasor quantity

B. Physical quantity

C. Scalar quantity

D. Vector quantity

What is the correct answer?

4

Steel is hard to magnetize because of its

A. Low permeability

B. High permeability

C. High density

D. High retentivity

What is the correct answer?

4

Permeability means

A. The conductivity of the material for magnetic lines of force

B. The magnetization test in the material after exciting field has been removed

C. The strength of an electromagnet

D. The strength of the permanent magnet

What is the correct answer?

4

Germanium atom has ______ protons and ______ electrons.

A. 32, 32

B. 32, 42

C. 42, 32

D. 34, 34

What is the correct answer?

4

Temporary magnets are commonly employed in

A. electric instruments

B. motors

C. moving coils loudspeakers

D. magnetos

What is the correct answer?

4

This paper does not exhibit electricity because it contains the same number of

A. protons and electrons

B. neutrons and electrons

C. neutrons and positrons

D. atoms

What is the correct answer?

4

The magnetic flux through a wire loop in a magnetic field does not d

A. T he area of the loop

B. The magnitude of the field

C. The shape of the loop

D. The angle between the plane of the loop and the direction

What is the correct answer?

4

The straight line passing through the two poles of magnet is called

A. Real axis

B. Cartesian axis

C. Magnetic axis

D. Imaginary axis